Sextant - Davis Mark 25

Sextant — Davis Mark 25

Advanced Plastic Sextant • Full-Horizon Beam Converger™ Optics

The Davis Mark 25 Sextant is the top-of-the-line plastic sextant from Davis Instruments, engineered to make celestial navigation clearer, easier, and more accessible—without sacrificing practical accuracy. Lightweight, stable, and thoughtfully designed, it’s a standout choice for students, offshore sailors, and navigators seeking a capable working sextant at an approachable price point.

At its core is Davis’ Beam Converger™ mirror (often called a full-horizon mirror), a distinctive optical solution that simplifies alignment and improves visibility—especially valuable when learning or working in low-light conditions.

🌟 What Sets the Mark 25 Apart

• 🔭 Beam Converger™ (Full-Horizon) Mirror — a specially coated, high-quality optical glass that allows you to see through the mirror while still capturing faint celestial objects, including low-light stars. This reduces confusion during alignment and makes sight-taking more intuitive.

• 💡 Integrated long-life LED illumination — lights the arc and drum for confident readings at dusk or night.

• 🧱 Upgraded, dimensionally stable plastic frame — lightweight yet rigid, designed to minimise distortion from temperature changes and handling.

• 🤲 Comfortable balance — easier to hold steady, particularly for newer users or during extended practice sessions.

🧭 Designed for Learning & Real-World Use

The Mark 25 is especially well regarded as a training and practice sextant. Its full-horizon optics shorten the learning curve by making it easier to bring the horizon and celestial body together—one of the most challenging steps for beginners.

At the same time, experienced navigators value it as a dependable backup sextant: light enough to carry, robust enough for regular use, and accurate enough for meaningful fixes when electronics are unavailable.

⚙️ Build & Optics

• Optical glass with special coating — clear, bright, and capable of resolving faint targets

• LED-illuminated scale — improved readability without external light

• Plastic construction with marine intent — corrosion-proof, practical, and forgiving in harsh environments

📦 What’s Included

• Davis Mark 25 Sextant

• Built-in LED illumination system

• Instruction booklet

🎯 Ideal For

• 🧭 Students of celestial navigation

• ⛵ Offshore cruisers and passagemakers

• 🏫 Sailing schools and training programs

• ⚓ Navigators wanting a reliable, lightweight backup

• 🎁 Nautical enthusiasts building practical skills

Important: This item is supplied to order.
Please allow up to 10 working days for delivery.

The Davis Mark 25 Sextant delivers advanced optics, thoughtful design, and real usability in a lightweight, accessible form—making it one of the most capable plastic sextants available today.

A smart instrument for learning the sky and navigating with confidence.